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Joint meeting with International Geosynthetics Society UK chapter
Speaker: Dr Alain Nancey, TenCate Geosynthetics
Basal reinforcement by geosynthetics of a piled embankment is a current technique, and with more than 20 years of experience, geosynthetics have proved their efficiency in reinforcing the base of embankments. Especially in northern Europe where geosynthetics are widely used in this application, even in difficult conditions.
Nevertheless the optimisation of the design remains a constant need to offer an economical, but also an environmental sustainable solution to the users, designers or contractors. Particularly for the reinforced piled embankment, the developments of soil improvement techniques require rethinking of the models used for the geosynthetics: how to correctly consider the load transfer to the piles and the behaviour of the geosynthetics reinforcement.
In this context, two main projects have been carried out to get a better understanding of the load transfer and then to offer an optimised solution: "ASIRI" (France) and a detailed study based on laboratory tests series by Deltares, an institute in the Netherlands.
As a result of these research programs, the influence of parameters like the fill material, the stiffness and the type and position of geosynthetics have been clearly demonstrated. Additionally, the load distribution between piles and over the geosynthetic has been found to be different from those taken in the standard design models. A new design model is proposed by S V Eekelen, giving results closer to on site measurements.
This presentation proposes to show a synthesis of the latest developments, including real projects examples.